A new control scheme for induction motors is proposed in the present paper, applying the interconnection and damping assignment-passivity based control （IDA-PBC） method. The scheme is based exclusively on passivity ...A new control scheme for induction motors is proposed in the present paper, applying the interconnection and damping assignment-passivity based control （IDA-PBC） method. The scheme is based exclusively on passivity based control, without restricting the input frequency as it is done in field oriented control （FOC）. A port-controlled Hamiltonian （PCH） model of the induction motor is deduced to make the interconnection and damping of energy explicit on the scheme. The proposed controller is validated under computational simulations and experimental tests using an inverter prototype.展开更多
A fractional frequency transmission system(FFTS)is the most competitive choice for long distance transmission of offshore wind power,while the Hexverter,as a newly proposed direct AC/AC converter,is an attractive choi...A fractional frequency transmission system(FFTS)is the most competitive choice for long distance transmission of offshore wind power,while the Hexverter,as a newly proposed direct AC/AC converter,is an attractive choice for its power conversion.This paper proposes a novel control scheme characterizing the global stability and strong robustness of the Hexverter in FFTS applications,which are based on the interconnection and damping assignment passivity-based control(IDA-PBC)methodology.Firstly,the frequency decoupled model of the Hexverter is studied and then a port-controlled Hamiltonian(PCH)model is built.On this basis,the IDAPBC scheme of the Hexverter is designed.Considering the interference of system parameters and unmodeled dynamics,integrators are added to the IDA-PB controller to eliminate the steady-state error.In addition,the voltagebalancing control is applied in order to balance the capacitor DC voltages to obtain a better performance.Finally,the simulation results and experimental results are presented to verify the effectiveness and superiority of the IDA-PB controller.展开更多
In this work, a Revisited form of the so-called Model-Free Control（R-MFC） is derived.Herein, the MFC principle is employed to deal with the unknown part of a plant only（i.e., unmodeled dynamics, disturbances, etc....In this work, a Revisited form of the so-called Model-Free Control（R-MFC） is derived.Herein, the MFC principle is employed to deal with the unknown part of a plant only（i.e., unmodeled dynamics, disturbances, etc.） and occurs beside an Interconnection and Damping AssignmentPassivity Based Control（IDA-PBC） strategy. Using the proposed formulation, it is shown that we can significantly improve the performance of the control through the reshaping properties of the IDA-PBC technique. Moreover, the control robustness level is increased via a compensation of the time-varying disturbances and the unmodeled system dynamics. This on-line compensation capability is provided by the MFC principle. The problem is studied in the case of Multi-Input Multi-Output（MIMO） mechanical systems with an explicit application to a small Vertical Take-Off and Landing（VTOL） Unmanned Aerial Vehicle（UAV） where a stability analysis is also provided. Numerical simulations have shown satisfactory results, in comparison with some other control strategies, where an in-depth discussion with respect to the control performance is highlighted by considering several scenarios and using several metrics.展开更多
文摘A new control scheme for induction motors is proposed in the present paper, applying the interconnection and damping assignment-passivity based control （IDA-PBC） method. The scheme is based exclusively on passivity based control, without restricting the input frequency as it is done in field oriented control （FOC）. A port-controlled Hamiltonian （PCH） model of the induction motor is deduced to make the interconnection and damping of energy explicit on the scheme. The proposed controller is validated under computational simulations and experimental tests using an inverter prototype.
基金supported by National Natural Science Foundation of China(No.51677142)Science and Technology Foundation of SGCC(Research on efficient integration of large scale long distance offshore wind farm and its key technologies in operation and control).
文摘A fractional frequency transmission system(FFTS)is the most competitive choice for long distance transmission of offshore wind power,while the Hexverter,as a newly proposed direct AC/AC converter,is an attractive choice for its power conversion.This paper proposes a novel control scheme characterizing the global stability and strong robustness of the Hexverter in FFTS applications,which are based on the interconnection and damping assignment passivity-based control(IDA-PBC)methodology.Firstly,the frequency decoupled model of the Hexverter is studied and then a port-controlled Hamiltonian(PCH)model is built.On this basis,the IDAPBC scheme of the Hexverter is designed.Considering the interference of system parameters and unmodeled dynamics,integrators are added to the IDA-PB controller to eliminate the steady-state error.In addition,the voltagebalancing control is applied in order to balance the capacitor DC voltages to obtain a better performance.Finally,the simulation results and experimental results are presented to verify the effectiveness and superiority of the IDA-PB controller.
文摘In this work, a Revisited form of the so-called Model-Free Control（R-MFC） is derived.Herein, the MFC principle is employed to deal with the unknown part of a plant only（i.e., unmodeled dynamics, disturbances, etc.） and occurs beside an Interconnection and Damping AssignmentPassivity Based Control（IDA-PBC） strategy. Using the proposed formulation, it is shown that we can significantly improve the performance of the control through the reshaping properties of the IDA-PBC technique. Moreover, the control robustness level is increased via a compensation of the time-varying disturbances and the unmodeled system dynamics. This on-line compensation capability is provided by the MFC principle. The problem is studied in the case of Multi-Input Multi-Output（MIMO） mechanical systems with an explicit application to a small Vertical Take-Off and Landing（VTOL） Unmanned Aerial Vehicle（UAV） where a stability analysis is also provided. Numerical simulations have shown satisfactory results, in comparison with some other control strategies, where an in-depth discussion with respect to the control performance is highlighted by considering several scenarios and using several metrics.
